does this work on Christmas lights

Yes, that is what I bought it for.

my tester quit after using for three days changed batteries the flashlight comes on and wont go off tester wil not work

Thank you very much for your feedback on using the DB03 product. Your information is very important to us. If you encounter the fault you mentioned, you can try the following operations: 1. Check whether the safety key is stuck and whether other safety key functions can work normally; 2. Check whether the battery size is too large, which may cause internal structure deformation; 3. After confirming the above two points, you can try to turn off and restart the device.

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Description

⚡ Stay ahead of the current—test smarter, safer, faster!

SMART AUTO SLEEP MODE - Extends battery life by powering down after 15 minutes of inactivity—ready when you are.
COMPACT PORTABLE DESIGN - Lightweight 59g body with pocket clip and LED flashlight keeps you prepared on the go.
NON CONTACT SAFETY DETECTION - Stay safe with instant live wire alerts via flashing red lights and buzzer—no direct contact needed.
CERTIFIED HIGH SAFETY STANDARDS - CE CAT II 1000V certified for reliable, professional-grade electrical testing.
PRECISION DUAL RANGE VOLTAGE TESTING - Switch effortlessly between 12V-1000V and 48V-1000V modes for pinpoint accuracy in any scenario.

The ZOTEK ZT-DB03 is a compact, battery-powered non-contact voltage tester with dual-range measurement (12V-1000V and 48V-1000V), ambient temperature display, and built-in LED flashlight. Designed for electricians and homeowners alike, it features audible and visual alerts for live wires, automatic sleep mode to conserve battery, and meets CE CAT II 1000V safety standards. Its lightweight, pocket-friendly design makes it an essential tool for precise, safe electrical diagnostics across home, industrial, and educational settings.

Specifications

Brand	ZOTEK
Power Source	Battery Powered
Style	Compact
Colour	Red
Item dimensions L x W x H	15.6 x 2.3 x 2.8 Centimeters
Min. Operating Voltage	12 Volts
Specification Met	CE
Measurement Type	Voltage Tester
Maximum Operating Voltage	1000 Volts
UPC	787309234625
Manufacturer	ZOYI
Country of Origin	China
Model number	ZT-DB03
Number of Memory Sticks	1
Item Weight	59 g
Product Dimensions	15.6 x 2.29 x 2.79 cm; 59 g
Batteries	2 AAA batteries required.
Item model number	ZT-DB03
Item Height	1.1 Inches
Item Width	0.9 Inches
Included Components	Non-Contact Test Pen User Manual
Are batteries included?	No
Lithium Battery Packaging	Batteries only

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